Stephanie Seymour and Her Son Bond On the Beach

But you'll never believe the identity of the love interest draped around her as she emerges from the surf.

It turns out the 41-year-old's touchy-feely partner in crime is Peter Brant Jr., her 17-year-old son!

The supermodel -- in a flesh-colored bikini -- is seen canoodling with her 17-year-old son, Peter, during a stroll on the beach. The two playfully hug (her hand on his hip, his on her... well, you can see for yourself) -- and at one point the polite gentleman even kisses his mother's hand. Aww!